Several collections of lesson books for practising mensural music published in Spain during the eighteenth century, known as canto de órgano, have been overlooked in musicological scholarship. These canto de órgano lessons allowed students to be trained in a wide variety of repertoire, from renaissance polyphony to modern-style monody. This article provides an initial overview of these printed collections and identifies noteworthy parallels with the didactic repertoires of other regions, such as Italian solfeggi. To that end, I present context and different Spanish opinions of the period on the usefulness of solfeggio collections and specific examples of collections that could serve as models of style. I analyse the way in which solfeo was practised, before proposing a classification. In assessing these works against other sources, I suggest that these lesson books were useful not only for the practice of reading music, but also for the cultivation of good taste in interpretation, improvisation and composition.